EP0193853B1 - 3(2h)pyridazinone, process for its preparation and anti-allergic agent containing it - Google Patents

3(2h)pyridazinone, process for its preparation and anti-allergic agent containing it Download PDF

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EP0193853B1
EP0193853B1 EP86102467A EP86102467A EP0193853B1 EP 0193853 B1 EP0193853 B1 EP 0193853B1 EP 86102467 A EP86102467 A EP 86102467A EP 86102467 A EP86102467 A EP 86102467A EP 0193853 B1 EP0193853 B1 EP 0193853B1
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Prior art keywords
pyridazinone
propyl
hydrogen
alkyl
propylamino
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German (de)
English (en)
French (fr)
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EP0193853A3 (en
EP0193853A2 (en
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Motoo Mutsukado
Keizo Tanikawa
Ken-Ichi Shikada
Ryozo Sakoda
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Nissan Chemical Corp
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Nissan Chemical Corp
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
    • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
    • C07D403/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A61P11/08—Bronchodilators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P27/00—Drugs for disorders of the senses
    • A61P27/16—Otologicals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/08—Antiallergic agents
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
    • C07D237/02—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings
    • C07D237/06—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D237/10—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D237/14—Oxygen atoms
    • C07D237/16—Two oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
    • C07D237/02—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings
    • C07D237/06—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D237/10—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D237/22—Nitrogen and oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/12—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

  • the present invention relates to a 3(2H)pyridazinone which exhibits antagonism against slow reacting substance of anaphylaxis (SRS-A) which induces a contraction of bronchial smooth muscle, and thus is useful as an anti-allergic agent, a process for its preparation and a pharmaceutical composition containing it.
  • SRS-A slow reacting substance of anaphylaxis
  • SRS-A is believed to be a principal etiologic substance which induces immediate allergy such as bronchial asthma or allergic rhinitis. Therefore, a medicine which controls the pharmacological effect of SRS-A, i.e., a SRS-A antagonist, is expected to be a useful anti-allergic agent.
  • Canadian Patent 784639 discloses 2-C 1 ⁇ C 8 -alkyl-4-chloro or bromo-5-benzylamino-3(2H)pyridazinone derivatives.
  • reference (a) discloses 2-C 1 ⁇ C 8 -alkyl-4-chloro or bromo-5-benzylamino-3(2H)pyridazinone derivatives.
  • the usefulness of the compounds disclosed in this reference (a) is restricted to a herbicide, and no mention is made as to its medical use or pharmacological activities.
  • the present inventors have synthesized and studied various compounds for antagonistic activities against SRS-A, and it has been surprisingly found that 3(2H)pyridazinones of the formula I and their pharmaceutically acceptable salts exhibit antagonistic activities against SRS-A and thus are useful as an active ingredient for an anti-allergic agent.
  • the present invention provides a 3(2H)pyridazinone of the formula: wherein R, is hydrogen or C 1 ⁇ C 5 alkyl; R 2 is hydrogen, C 1 ⁇ C 8 alkyl, chlorine or bromine; A is -NR 3 -(wherein R 3 is hydrogen or C 1 ⁇ C 4 alkyl) or -0-; X is ⁇ (CH 2 ) n ⁇ (wherein n is an integer of 1 to 4), ⁇ CH(OR 4 ) ⁇ (wherein R 4 is hydrogen or C l -C4 alkyl), -CO- or a single bond; when X is ⁇ (CH 2 ) n ⁇ (wherein n is as defined above) or a single bond, B is -0-, -S-, -NH-, ⁇ OSO 2 ⁇ , or -OCO- or a single bond, when X is ⁇ CH(OR 4 ) ⁇ (wherein R 4 is as defined above), B is ⁇ O ⁇ , ⁇ S ⁇ (where
  • the present invention also provides a process for producing the pyridazinone of the formula I: wherein R 1 is hydrogen or C 1 ⁇ C 5 alkyl); R 2 is hydrogen, C 1 ⁇ C 8 alkyl, chlorine or bromine; A is -NR 3 -(wherein R 3 is hydrogen or C 1 ⁇ C 4 alkyl) or -0-; X is ⁇ (CH 2 )n ⁇ (wherein n is an integer of 1 to 4), -CH(OR 4 )- (wherein R 4 is hydrogen or C 1 ⁇ C 4 alkyl) or a single bond; B is -0-, -S- or -NH-; and each of Y 1 , Y 2 and Y 3 which may be the same of different, is hydrogen, C 1 ⁇ C 8 alkyl, C 2 ⁇ C 8 alkenyl, halogen, ⁇ OR 5 (wherein R 5 is hydrogen or C 1 ⁇ C 4 alkyl), -C0 2 R 6 (wherein R 6 is hydrogen or C
  • A includes oxygen, unsubstituted amino (-NH-), methylamino, ethylamino, n-propylamino, i-propylamino, n-butylamino, sec-butylamino and i-butylamino.
  • B includes oxygen, sulfur, sulfonyloxy, carbonyloxy, unsubstituted amino (-NH-) and a single bond.
  • X includes methylene, ethylene, propylene, butylene, a single bond, hydroxymethylene, methoxy- methylene, ethoxymethylene, n-propoxymethylene, i-propoxymethylene, n-butoxymethylene, i-butoxymethylene, sec-butoxymethylene and oxomethylene
  • Each of Y 1 , Y 2 and Y 3 which may be the same or different, includes hydrogen, methy, ethyl, n-propyl, i-propyl, n-butyl- i-butyl, sec-butyl, n-pentyl, i-pentyl, sec-pentyl, n-hexyl, i-hexyl, sec-hexyl, n-heptyl, n-octyl, vinyl,1-propenyl, allyl, 1-butenyl, 2-butenyl,1-pentenyl,1-hexenyl,1-heptenyl,1-octenyl, fluorine, chlorine, bromine, iodine, hydroxy, methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, sec-butoxy, carboxy, methoxycarbonyl,
  • the compounds of the formula I of the present invention may be prepared in accordance with the following nineteen Processes 1 to 19.
  • R,, R 2 , A, Y 1 , Y 2 , Y 3 and n are as defined above with respect to the formula I, and Z is chlorine or bromine and B is -0-, -S- or a single bond.
  • Process 1 is a process for producing a compound of the formula VIII by reacting a 3(2H)-pyridazinone compound of the formula II with another starting material compound of the formula VII in an inert solvent in the presence of a dehydrohalogenating agent.
  • an ether solvent such as isopropyl ether, tetrahydrofuran or 1,4-dioxane, an amide solvent such as N,N-dimethylformamide, N-methylacetamide or N-methylpyrrolidone, dimethylsulfoxide, an alcohol solvent such as methanol or ethanol, a hydrocarbon solvent such as toluene or benzene, pyridine or water, or a solvent mixture comprising two or more solvents selected from such solvents.
  • an ether solvent such as isopropyl ether, tetrahydrofuran or 1,4-dioxane
  • an amide solvent such as N,N-dimethylformamide, N-methylacetamide or N-methylpyrrolidone
  • dimethylsulfoxide an alcohol solvent such as methanol or ethanol
  • a hydrocarbon solvent such as toluene or benzene
  • pyridine pyridine or water
  • R 2 and Z are the same halogen atoms
  • good results are obtainable by using a solvent having high polarity such as water, an alcohol or an ether, or a solvent mixture thereof.
  • a solvent having high polarity such as water, an alcohol or an ether, or a solvent mixture thereof.
  • the isolation and purification of the desired product can readily be accomplished by a usual method such as crystallization or silica gel chromatography.
  • an inorganic base such as potassium carbonate or sodium carbonate
  • an organic base such as triethylamine or pyridine
  • an inter-phase transfer catalyst such as triethylbenzylammonium chloride may be added as a catalyst to the reaction system.
  • the reaction temperature may be within a range of from room temperature to the boiling point of the solvent used for the reaction system.
  • the molar ratio of the starting materials may optionally be set. However, preferred results are obtainable when the compound of the formula VII is used in an amount of from 1 to 5 mols relative to 1 mol of the pyridazinone derivative of the formula II.
  • reaction time There is no particular restriction as to the reaction time. However, it is common to conduct the reaction for from 1 to 20 hours.
  • R i , R 2 , A, Y 1 , Y 2 , Y 3 and n are as defined above with respect to the formula I, X is chlorine, bromine or iodine, and B is -0-, -S- or a single bond.
  • Process 2 is a process for producing a compound of the formula VIII by reacting a pyridazinone compound of the formula IX having -AH (wherein A is as defined above) at the 5-position, with a compound of the formula X in the presence of an organic or inorganic base.
  • a solvent a usual solvent inert to the reaction may be employed.
  • the organic base a usual amine such as triethylamine or pyridine may be mentioned.
  • the inorganic base sodium carbonate or potassium carbonate may be mentioned.
  • a metal hydride such as sodium hydride may be employed, as the case requires.
  • the reaction conditions and the isolation and purification of the desired product may be suitably selected in the same manner as in Process 1.
  • R 1 , R 2 , A, Y 1 , Y 2 , Y 3 and n are as defined above with respect to the formula I, each of X 1 , and X 2 which may be the same or different, is chlorine, bromine or iodine, and B is -0-, -S- or -NH-.
  • Process 3 comprises Steps A and B. Namely, a compound of the formula IX is reacted with a compound of the formula XI in an inert solvent in the presence of a base to obtain a compound of the formula XII (Step A), and then the compound of the formula XII is reacted with a phenol, a thiophenol or an aniline of the formula VI in the presence of a dehydrohalogenating agent to obtain a compound of the formula XIII (Step B).
  • reaction conditions for Steps A and B and the isolation and purification of the desired product may suitably be selected in the same manner as in Process 1.
  • R 1 ,R 2 , A, Y 1 , Y 2 and Y 3 are as defined above with respect to the formula I, Z is chlorine or bromine X is ⁇ (CH 2 ) n ⁇ (wherein n is an integer of 1 to 4), -CH(OR 4 )- (wherein R 4 is hydrogen or C 1 ⁇ C 4 alkyl) or a single bond, B is -0-, -S- or -NH-, and T is chlorine, bromine or iodine.
  • Process 4 comprises Steps A, B and C. Namely, Process 4 comprises reacting a compound of the formula II with a compound of the formula III in an inert organic solvent in the presence of a dehydrohalogenating agent to obtain a compound of the formula IV (Step A), then reacting this compound with p-toluenesulfonyl chloride, methanesulfonyl chloride or a halogenating agent as described hereinafter in the presence of a dehydrohalogenating agent to obtain a compound of the formula V (Step B), and reacting this compound with a phenol, a thiophenol or an aniline of the formula VI in an inert organic solvent in the presence of a dehydrohalogenating agent to obtain a compound of the formula XIV (Step C).
  • the dehydrohalogenating agent which may be employed, includes an inorganic base such as potassium carbonate or sodium carbonate, and an organic base such as triethylamine or pyridine.
  • an inorganic base such as potassium carbonate or sodium carbonate
  • an organic base such as triethylamine or pyridine.
  • the reaction temperature and the reaction time There is no particular restriction as to the reaction temperature and the reaction time. However, it is common to conduct the reaction at a temperature within a range of from room temperature to the boiling point of the solvent for from 1 to 24 hours.
  • the type of the solvent used, the molar ratio of the starting materials and the isolation and purification of the desired product may suitably be selected in the same manner as in Process 1.
  • the dehydrohalogenating agent to be used together with p-toluenesulfonyl chloride or methansulfonyl chloride includes an amine such as triethylamine or pyridine. Such an amine may also be employed as a solvent. Further, there may be employed a solvent which is inert to the reaction, for instance, a hydrocarbon solvent such as hexane, benzene, toluene or petroleum ether, an ether solvent such as ethyl ether, isopropyl ether or tetrahydrofuran, or a ketone solvent such as acetone or methyl ethyl ketone.
  • a hydrocarbon solvent such as hexane, benzene, toluene or petroleum ether
  • an ether solvent such as ethyl ether, isopropyl ether or tetrahydrofuran
  • ketone solvent such as acetone or methyl ethyl
  • reaction temperature and the reaction time it is common to conduct the reaction at a temperature of from -15 to 40°C for from 30 minutes to 2 hours.
  • the desired product may be isolated by removing by-product amine salts, then drying the separated organic layer, distilling off the solvent, subjecting the oily substance or crystals thereby obtained to chromatography or crystallization.
  • a halogenating agent thionyl chloride, thionyl bromide, phosphorus trichloride or hydroiodic acid may be suitably employed.
  • a solvent inert to the reaction, for instance, a hydrocarbon solvent such as benzene, hexane or petroleum ether, or an ether solvent such as ethyl ether or isopropyl ether.
  • a hydrocarbon solvent such as benzene, hexane or petroleum ether
  • an ether solvent such as ethyl ether or isopropyl ether.
  • a compound of the formula V wherein T is iodine can readily be obtained by reacting a compound of the formula V wherein T is chlorine, bromine, p-toluenesulfonyloxy or methanesulfonyloxy, with potassium iodide or sodium iodide in a suitable solvent.
  • the isolation of the desired product after the completion of the reaction can readily be carried out by distilling off the solvent, adding water and an organic solvent such as benzene or ethyl ether to the residue, vigorously shaking the mixture, drying and concentrating the organic layer thus separated, and subjecting the oily substance or crystals thereby obtained to chromatography or crystallization.
  • an organic solvent such as benzene or ethyl ether
  • R 1 , R 2 , A, Y" Y2 and Y 3 are as defined above with respect to the formula I, X is-(CH2)n- (wherein n is an integer of 1 to 4), -CH(OR 4 )- (wherein R 4 is hydrogen or C l -C 4 alkyl) or a single bond, and Q is -CO- or ⁇ SO 2 ⁇ .
  • Process 5 is a process for producing a compound of the formula XVI by reacting a 3(2H)-pyridazinone compound of the formula IV obtained in Process 4, with an acid chloride of the formula XV in an inert solvent in the presence of a dehydrohalogenating agent such as triethyleamine or pyridine.
  • a dehydrohalogenating agent such as triethyleamine or pyridine.
  • the solvent there may be employed an ether solvent such as isopropyl ether, tetrahydrofuran or 1,4-dioxane, an amide solvent such as N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyrrolidone or a halogenated alkyl solvent such as chloroform or dichloromethane.
  • the reaction temperature may be within a range of from -15°C to the boiling point of the solvent used, but is preferably from -15 to 30°C.
  • the molar ratio of starting materials may optionally be set. However, it is preferred that the acid chloride of the formula XV is used in an amount of from 1 to 2 mols relative to 1 mol of the 3(2H)-pyridazinone compound of the formula IV.
  • the isolation of the desired product after the completion of the reaction can readily be carried out by firstly removing the by-product amine hydrochlorides, adding water to the residue, vigorously shaking the mixture, drying and concentrating the organic layer thus separated, and subjecting the oily substance or crystals thereby obtained to chromatography or crystallization.
  • R,, R 2 , A, X, Y 1 and Y 2 are as defined above with respect to the formula I, and B is -0-, ⁇ S ⁇ . -NH- or a single bond.
  • Process 6 is a process for producing a compound of the formula XVIII having a group by reacting a compound of the formula XVII having a-CN group, with a hydroazoate of the formula MN 3 (wherein M is an alkali metal).
  • hydrazoate to be used for the reaction there may be employed an alkali metal salt of hydrazoic acid such as lithium azide, sodium azide or potassium azide.
  • hydrazoates may be used alone.
  • sodium azide may be used in combination with a Lewis acid such as aluminum chloride, stannic chloride, zinc chloride or titanium tetrachloride, or with ammonoium chloride.
  • a combination of sodium azide and ammoniun chloride is particularly preferred.
  • an organic solvent there may be mentioned a hydrocarbon solvent such as benzene, toluene or petroleum ether, an ether solvent such as tetrahydrofuran, dioxane, ethylene glycol or dimethyl ether, an amide solvent such as dimethylformamide or formamide and dimethylsulfoxide.
  • a hydrocarbon solvent such as benzene, toluene or petroleum ether
  • an ether solvent such as tetrahydrofuran, dioxane, ethylene glycol or dimethyl ether
  • an amide solvent such as dimethylformamide or formamide and dimethylsulfoxide.
  • the resulting compound of the formula XVIII will be in the form of a salt corresponding to the salt of hydrazoic acid used for the reaction due to the acidity of the tetrazole ring.
  • an acid i.e. a mineral acid such as hydrochloric acid or sulfuric acid, it is possible to readily obtain the desired compound of the formula XVIII having a free tetrazole ring.
  • R 2 , A, Y 1 , Y 2 and Y 3 are as defined above, X is ⁇ (CH 2 ) n ⁇ (wherein n is an integer of 1 to 4), ⁇ CH(OR 4 ) ⁇ (wherein R 4 is hydrogen or C l -C 4 alkyl) or a single bond, and B is ⁇ 0 ⁇ , ⁇ S ⁇ , ⁇ NH ⁇ or a single bond.
  • Process 7 is a process for producing a compound of the formula XX by treating a compound of the formula XIX having a tertiary butyl group as a protective group at the 2-position, with a mineral acid such as sulfuric acid, hydrochloric acid or hydrobromic acid to remove the tertiary butyl group.
  • a mineral acid such as sulfuric acid, hydrochloric acid or hydrobromic acid
  • a solvent to be used there may be employed an alcohol solvent, a hydrocarbon solvent, a halogenated hydrocarbon solvent or water, or a solvent mixture of such solvents.
  • Y I , Y 2 or Y 3 is a -CN group
  • the reaction conditions such as the reaction temperature or reaction time are not critical, but it is common to conduct the reaction at a temperature around the boiling point of the solvent used, for from 1 hour to 2 days.
  • the isolation of the desired product after the completion of the reaction may be carried out by distilling off the solvent, adding an organic solvent such as ethyl acetate or chloroform and water to the residue, shaking the mixture, drying and concentrating the organic layer thereby separated, and purifying the substance thus obtained, by recrystallization or chromatography.
  • an organic solvent such as ethyl acetate or chloroform and water
  • R 1 is C 1 ⁇ C 5 alkyl
  • B is -0-, -S- or a single bond
  • R 2 , A, n, Y 1 , Y 2 and Y 3 are as defined above with respect to the formula I.
  • Process 8 is a process for producing a 3(2H)pyridazinone of the formula XXII with the 2- position alkylated, by reacting a compound of the formula XXI with an alkyl halide of the formula R,X in the presence of a base.
  • an ether solvent such as isopropyl ether, tetrahydrofuran or 1,4-dioxane, an amide solvent such as N,N-dimethylformamide, N-methylacetamide or N-methylpyrrolidone, dimethylsulfoxide, an alcohol solvent such as methanol or ethanol, a hydrocarbon solvent such as toluene or benzene, a ketone solvent such as acetone or methyl ethyl ketone, or water.
  • an ether solvent such as isopropyl ether, tetrahydrofuran or 1,4-dioxane
  • an amide solvent such as N,N-dimethylformamide, N-methylacetamide or N-methylpyrrolidone
  • dimethylsulfoxide an alcohol solvent such as methanol or ethanol
  • a hydrocarbon solvent such as toluene or benzene
  • a ketone solvent such as acetone or methyl ethyl
  • the purification of the desired product may readily be accomplished by crystallization or silica gel chromatography.
  • an inorganic base such as potassium carbonate or sodium carbonate
  • an organic base such as triethylamine or pyridine
  • An inter-phase transfer catalyst such as triethylbenzyl ammonium chloride may be added as a catalyst to the reaction system, as the case requires.
  • the reaction temperature may be within a range of from room temperature to the boiling point of the solvent used for the reaction system.
  • the molar ratio of the starting materials may optionally be set. However, good results can be obtained when the compound of the formula R,X is used in an amount of from 1 to 5 mols relative to 1 mol of the pyridazinone derivative of the formula XXI.
  • R 1 , R 2 , A, X, Y 1 and Y 2 are as defined above with respect to the formula I, B is ⁇ 0 ⁇ , ⁇ S ⁇ , ⁇ NH ⁇ or a single bond, and R 14 is ⁇ CO 2 R 6 (wherein R 6 is C 1 ⁇ C 4 alkyl) or -CN.
  • Process 9 is a process for converting a compound of the formula XXIII to the corresponding carboxylic acid or its salt by hydrolyzing R 14 (wherein R 14 is as defined above) of the compound of the formula XXIII under an acidic or alkaline condition.
  • the solvent for the reaction there may be employed water or an organic solvent such as ethanol, methanol, tetrahydrofuran or dioxane, or a mixture of water with such organic solvents.
  • the reaction temperature, the reaction time or other reaction conditions it is common to conduct the reaction at a temperature of from 10 to 100°C for from 1 to 5 hours.
  • the isolation of the desired product after the completion of the reaction may be conducted by separating and purifying the precipitated crystals or freed oily substance by recrystallization or silica gel chromatography.
  • R 1 , R 2 , R 6 , R 8 , Rg, A and X are as defined above with respect to the formula I, and B is ⁇ 0 ⁇ , ⁇ S ⁇ or a single bond.
  • Process 10 is a process for producing an amide compound of the formula XXV by reacting a compound of the formula XXIV with an amine of the formula
  • the desired product can readily be obtained by a usual aminolysis or ammonolysis by an addition of an amine or by an addition of ammonia.
  • an organic solvent As such an organic solvent, an alcohol solvent such as ethanol or methanol, or an ether solvent such as tetrahydrofuran or dioxane, may be mentioned. Further, it is possible to use a mixture of such an organic solvent with water.
  • the reaction conditions such as the reaction temperature or the reaction time. However, it is common to conduct the reaction at a temperature of from 50 to 150°C for from 1 to 15 hours.
  • the starting material is a carboxylic acid (wherein R 6 is hydrogen)
  • the desired product can readily be obtained by reacting it with an amine in the form of an acid halide or in the presence of a dehydration condensation agent, or heating an amine salt of the corresponding carboxylic acid.
  • the isolation of the desired product after the completion of the reaction can readily be carried out by collecting crude crystals of the desired product precipitated in the reaction system by filtration, followed by recrystallization, or in a case where no crystals precipitate, by distilling off the solvent, adding an organic solvent, i.e. a usual solvent for extraction such as ethyl acetate or chloroform, and water, vigorously shaking the mixture, concentrating the organic layer thereby obtained, and subjecting the resulting crude crystals to recrystallization or silica gel chromatography.
  • an organic solvent i.e. a usual solvent for extraction such as ethyl acetate or chloroform
  • R 1 , R 2 , A, Y 1 , Y 2 and Y 3 are as defined above with respect to the formula I, Z is chlorine or bromine, and B is -0-, -S- or ⁇ NH ⁇ ,
  • Process 11 comprises a step of reacting a compound of the formula IX as used in Process 2, with an epihalohydrin of the formula in an inert solvent in the presence of a base to obtain an epoxy compound of the formula XXVI (Step A) and a step of reacting the compound of the formula XXVI with a phenol, a thiophenol or an aniline in the presence of a basic catalyst to obtain a compound of the formula XXVII (Step B).
  • Step A and the isolation of the desired product may be similar to those in Process 1.
  • A is -NR 3 - (wherein R 3 is as defined above with respect to the formula I)
  • an aprotic solvent such as dimethylformamide, dimethylacetamide or tetrahydrofuran
  • a metal hydride such as sodium hydride
  • the solvent may be the same as in Step A.
  • the reaction can adequately be conducted in the absence of a solvent.
  • the basic catalyst it is preferred to use a usual inorganic base such as sodium carbonate or potassium carbonate, or a quaternary ammonium base such as trimethylbenzylammoniumhydroxide.
  • the reaction temperature and the reaction time it is common to conduct the reaction at a temperature of from 20°C to the boiling point of the solvent used, for from 20 minutes to two hours.
  • R is C,-C S alkyl
  • R 3 is C l -C 4 alkyl
  • X is ⁇ (CH 2 ) n ⁇ (wherein n is an integer of 1 to 4) or -CH(OR) 4 - (wherein R 4 is as defined above with respect to the formula I) or a single bond
  • B is -0- or ⁇ S ⁇
  • Y 1 , Y 2 and Y 3 are as defined above with respect to the formula I.
  • Process 12 is a process for producing a compound of the formula XXIX by reacting a compound of the formula XXVIII with an alkyl halide of the formula R 3 Hal (wherein Hal is halogen such as chlorine, bromine or iodine) in the presence of a metal hydride such as sodium hydride.
  • Hal is halogen such as chlorine, bromine or iodine
  • the process can be conducted by reacting the compound of the formula XXVIII firstly with the metal hydride in an organic solvent, and then with the alkyl halide of the formula R 3 Hal.
  • organic solvent an inert organic solvent such as dimethylformamide, tetrahydrofuran or diethyl ether is preferably employed.
  • the reaction with the alkali metal hydride is conducted preferably at a temperature within a range of from -15 to 10°C
  • the reaction with the alkyl halide is conducted preferably at a temperature within a range of from 0 to 80°C.
  • the isolation and purification of the desired product after the completion of the reaction can be conducted in the same manner as in Process 8.
  • R is C 1 -C 5 alkyl
  • R 4 is C 1 -C 4 alkyl
  • B is ⁇ 0 ⁇ or -S8
  • X is chlorine, bromine or iodine
  • R 2 , A, Y 1 , Y 2 and Y 3 are as defined above with respect to the formula I.
  • Process 13 is a process for producing a compound of the formula XXXI by reacting a compound of the formula XXX with an alkyl halide of the formula R 4 X (wherein R 4 and X are as defined above) to convert the -OH group in the side chain to a -OR 4 group.
  • reaction conditions and the isolation of the desired product may be similar to those in Process 8.
  • R1, R 2 , A, Y 1 ,Y 2 and Y 3 are as defined above with respect to the formula I, and B is ⁇ 0 ⁇ or ⁇ S ⁇ .
  • Process 14 is a process for producing a compound of the formula XXXIII by reacting a compound of the formula XXXII having a -OH group with an oxidizing agent commonly employed for organic reactions to convert the >CHOH group to a >CO group.
  • any oxidation method commonly employed for the oxidation of alcohols such as Jone's oxidation, Collin's oxidation, Moffat oxidation (dimethylsulfoxide/N,N'-dicyclohexylcarbodimide) or a modification thereof (dimethylsulfoxide/acetic anhydride or trifluoroacetic anhydride) may be employed.
  • Jone's oxidation collin's oxidation
  • Moffat oxidation dimethylsulfoxide/N,N'-dicyclohexylcarbodimide
  • a modification thereof dimethylsulfoxide/acetic anhydride or trifluoroacetic anhydride
  • the isolation and purification of the desired product after the completion of the reaction may readily be conducted by adding water and a usual organic solvent for extraction to the reaction solution, shaking the mixture, drying and concentrating the organic layer thereby obtained, and subjecting the crude crystals or oily substance thus obtained, to recrystallization or silica gel chromatography.
  • R 1 , A, X, B, Y i , Y 2 and Y 3 are as defined above with respect to the formula I, and R 2 is chlorine or bromine.
  • Process 15 is a process for producing a compound of the formula XXXV by subjecting a compound of the formula XXXIV having chlorine or bromine at the 4-position of the pyridazinone, to usual hydrogenation (i.e. common hydrogenation wherein palladium or platinum is used as a catalyst) for dehalogenation.
  • usual hydrogenation i.e. common hydrogenation wherein palladium or platinum is used as a catalyst
  • organic solvent a usual inert solvent may be employed, but an alcohol solvent such as ethanol or methanol is particularly preferred.
  • the reaction temperature may be within a range of from 10°C to the boiling point of the organic solvent used, but is preferably within a range of from 20 to 60°C.
  • the isolation of the desired product after the completion of the reaction can readily be conducted by firstly filtering off the catalyst, concentrating the filtrate, dissolving the residue in a usual solvent for extraction such as ethyl acetate, chloroform or benzene, adding water or an aqueous hydrochloric acid solution (about 10%), shaking the mixture, drying and concentrating the organic layer, subjecting the crude crystals or oily substance thereby obtained, to recrystallization or silica gel chromatography.
  • R,, R 2 , R 7 , A, X, Y, and Y 2 are as defined above, and B is -0- or -S-.
  • an organic amine catalyst such as piperidine or pyrrolidine
  • an inorganic basic catalyst such as potassium acetate or sodium acetate
  • a solvent inert to the reaction for instance, a hydrocarbon solvent such as benzene or toluene, an ether solvent such as 1,4-dioxane or tetrahydrofuran, an alcohol solvent such as ethanol or propanol, or an amine solvent such as pyridine or triethylamine, may be employed.
  • a hydrocarbon solvent such as benzene or toluene
  • an ether solvent such as 1,4-dioxane or tetrahydrofuran
  • an alcohol solvent such as ethanol or propanol
  • an amine solvent such as pyridine or triethylamine
  • the isolation and purification of the desired product after the completion of the reaction can readily be carried out by firstly acidifying the reaction solution with a mineral acid such as hydrochloric acid, extracting it with a suitable organic solvent such as ethyl acetate, chloroform or ethyl ether, distilling off the organic solvent, and subjecting the residue thereby obtained, to crystallization or silica gel chromatography.
  • a mineral acid such as hydrochloric acid
  • a suitable organic solvent such as ethyl acetate, chloroform or ethyl ether
  • R 1 , R 2 , A, X, Y 1 , and Y 2 are as defined above with respect to the formula I, and B is ⁇ O ⁇ or ⁇ S ⁇ .
  • Process 17 is a proces for producing a compound of the formula XXXIX by demethylating a compound of the formula XXXVIII to convert the -OMe group to a -OH group.
  • the demethylating agent it is preferred to use a reagent obtained by a combination of a hard acid and a soft base, such as aluminum chloride/di-n-propylsulfide.
  • a solvent inert to the reaction such as dichloromethane or dichloroethane
  • the reaction temperature and the reaction time may be set within wide ranges. However, it is common to conduct the reaction at a temperature of from 0 to 30°C for from 5 to 48 hours.
  • R,, R 2 , A, X, B, Y 1 and Y 2 are as defined above with respect to the formula I, and R 6 is C 1 -C 4 alkyl.
  • Process 18 is a process for producing a compound of the formula XLI by esterifying a compound of the formula XL having a -C0 2 H group by means of various conventional esterification methods.
  • the following methods (a) to (d) may be employed for the esterification.
  • R 1 , R 2 , A, X, B, Y 1 , and Y 2 are as defined above with respect to the formula I.
  • Process 19 is a process for producing a compound of the formula XLIII by converting the -CONH 2 group in the compound of the formula XLII to a -CN group by various methods commonly employed.
  • various reaction examples are disclosed, for instance, in Compendium of Organic Synthetic Method (1971) Vol. I, p 464-465. It is possible to obtain a desired product by suitably selecting one of the conventional methods depending upon the chemical or physical properties of A, X, B, Y 1 , and Y 2 in the compound of the formula XLII.
  • R is the same as defined above with respect to the formula I, and R 2 , Z and Hal are chlorine or bromine.
  • Process 2-1 is a reaction for the production of the compound of the formula Ila by the ring closure reaction of a hydrazine or its acid salt with a mucochloric acid or mucobromic acid.
  • Process 2-2 is a reaction for the production of the compound of the formula Ila by reacting 4,5-(dichloro or bromo)-3(2H)-pyridazinone with a compound of the formula R,-Hal (wherein R, is alkyl, and Hal is chlorine, bromine or iodine).
  • Process 2-1 or Process 2-2 may optionally be selected. While it is advantageous to employ Process 2-1 from the viewpoint of the yield and operation efficiency, it is usually advantageous to employ Process 2-2 when a hydrazine is commercially hardly available or difficult to produce economically.
  • the compound of the formula II wherein R 2 is C 1 -C 8 alkyl may be prepared by a process as shown in reaction scheme 3 or 4.
  • R, and Z are the same as defined above with respect to the formula Ila, X is bromine or iodine, and R 2 is C 1 ⁇ C 8 alkyl.
  • such a compound may readily be prepared by reacting a 2-alkyl-4,5-di-(chloro or bromo)-3-(2H)pyridazinone of the formula: with a Grignard reagent of the formula R 2 MgX in the presence of an inert gas.
  • a solvent there may be employed a hydrocarbon solvent such as toluene or benzene, and an ether solvent such as tetrahydrofuran or ethyl ether.
  • the reaction temperature may be within a range of from 0°C to the boiling point of the solvent used for the reaction.
  • the molar ratio of the starting materials may optionally be set. However, it is common to use from 1 to 5 mols, preferably from 1 to 3 mols, of the Grignard reagent relative to 1 mol of the 4,5-di-(chloro or bromo)-3(2H)pyridazinone.
  • the compound of the formula llb may also be obtained by reacting 4,5-di-(chloro or bromo)-3-(2H)pyridazinone of the formula Ilc having no substituent at the 2-position with a Grignard reagent of the formula R 2 MgX to obtain a compound of the formula lid, and reacting the compound of the formula lld with an alkyl halide of the formula R 1 ,Hal.
  • Step (a) may be conducted under the conditions similar to those of reaction scheme 3. Likewise, Step (b) may be conducted in the same manner as in reaction scheme 2-2.
  • the 3(2H)pyridazinone compound of the formula Ile having a hydroxyl group at the 5-position, as a starting material in processes 2, and 11, may be prepared by a conventional method as shown by reaction scheme 5.
  • R, and R 2 are as defined above with respect to the formula I, and Z is chlorine or bromine.
  • the compound of the formula Ile can be readily obtained by reacting the 3(2H)pyridazinone compound of the formula II having chlorine or bromine at the 5-position, with an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide in water or an alcohol solvent such as ethanol or methanol, or in a solvent mixture thereof at a temperature within a range of from 50°C to the boiling point of the solvent used.
  • an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide
  • water or an alcohol solvent such as ethanol or methanol
  • the compound of the formula Ilf having -NHR 3 (wherein R 3 is as defined above with respect to the formula I) at the 5-position, may be prepared by a conventional method as shown by the following Reaction scheme 6.
  • R 1 , R 2 and R 3 are as defined above with respect to the formula I, and Z is chlorine or bromine.
  • the compound of the formula llf can be obtained by reacting a pyridazinone compound of the formula II with a compound of the formula H 2 NR 3 .
  • a polar solvent such as water, methanol, ethanol, tetrahydrofuran, 1,4-dioxane, dimethylformamide or pyridine, is particularly preferred.
  • an amine compound of the formula H 2 NR 3 as the solvent.
  • R 3 is hydrogen i.e. H 2 NR 3 is ammonia
  • the desired product can readily be obtained in good yield by reacting the compound of the formula II with ammonia under pressure.
  • Method A is a process for producing a compound of the formula A-3 by reacting a compound of the formula A-1 with a phenol, a thiophenol or an aniline of the formula A-2 in a usual solvent in the presence of a dehydrohalogenating agent.
  • Method B is a process for producing a compound of the formula B-4 by reacting a compound of the formula B-1 with a phenol, thiophenol or an aniline of the formula B-2 in the presence of a dehydrohalogenating agent to obtain a compound of the formula B-3, and then hydrolyzing this compound with an aqueous solution of a metal hydroxide such as sodium hydroxide, if necessary, after reacting it with a metal acetate such as sodium acetate to convert it into an acetate.
  • a metal hydroxide such as sodium hydroxide
  • X and B are as defined above with respect to Method A, and M, is sodium or potassium.
  • Method C is a process wherein the halide of the formula C-1 obtained in Method B is reacted with a metal cyanide of the formula C-2 to obtain a cyano compound, which is then converted by a reducing agent to a corresponding amino compound.
  • Method D is a process wherein a compound of the formula D-1 is subjected to ammonolysis reaction to convert it to a substituted amine of the formula D-2.
  • B is -0- or -S-.
  • Method E is a process wherein a compound of the formula E-1 obtained in the same manner as in Method C, is subjected to amidation to obtain a corresponding amide compound of the formula E-2, which is then converted to an amino compound of the formula E-2 by a Hoffmann reaction.
  • Method F is a process wherein a halide of the formula F-1 is reacted with NaN0 2 to obtain a corresponding nitro compound of the formula F-2, which is then treated with a reducing agent such as a Fe/ FeS0 4 type reducing agent, to obtain a corresponding amine of the formula F-3.
  • a reducing agent such as a Fe/ FeS0 4 type reducing agent
  • Method G is a process for producing a compound of the formula G-3 by reacting a benzene of the formula G-1 with a compound of the formula G-2 by a Friedel-Crafts reaction.
  • Method H is a process wherein an alcohol compound of the formula H-1 is halogenated with a halogenating agent to a compound of the formula H-2, which is then converted to a Grignard reagent of the formula H-3, which is then reacted with ethylene oxide to obtain a compound of the formula H-4.
  • Method I is a process wherein a benzene of the formula 1-1 is reacted with an acid anhydride of the formula l-2 by a Friedel-Crafts reaction to obtain a compound of the formula 1-3, which is then reduced by a reducing agent to an alcohol compound of the formula 1-4.
  • R 3 is C 1 -C 4 alkyl.
  • Method J is a process wherein a benzene of the formula J-1 and an acid chloride of the formula J-2 are reacted by a Friedel-Crafts reaction to obtain a compound of the formula J-3, which is further reduced by a reducing agent to an alcohol compound of the formula J-4.
  • Method K is a process wherein an alcohol compound of the formula K-1 is halogenated by a halogenating agent to obtain a halide of the formula K-2, which is then reacted with a metal cyanide to obtain a cyanide of the formula K-3, and the -CN group of this cyanide is reduced to obtain an amine compound of the formula K-4.
  • Method L is a process wherein a compound of the formula L-1 and sodium nitrite were reacted to obtain a nitro compound of the formula L-2, and this compound was reacted with a reducing agent to obtain an amine compound of the formula L-3.
  • a non-oral administration by injection subcutaneous, intravenous, intramuscular or intraperitoneal injection
  • an ointment a suppository or an aerosol
  • the above pharmacological or verterinary composition contains a compound of the present invention in an amount of from about 0.1 to about 99.5% by weight, based on the total weight of the composition.
  • a compound of the present invention in an amount of from about 0.1 to about 99.5% by weight, based on the total weight of the composition.
  • other pharmacologically or veterinarily active compounds may be incorporated.
  • the composition of the present invention may contain a plurality of compounds of the present invention.
  • the clinical dose of the compound of the present invention varies depending upon the age, the body weight, the sensitivity or the symptom, etc. of the patient.
  • the effective daily dose is usually from 0.003 to 1.5 g, preferably from 0.01 to 0.6 g, for an adult. However, if necessary, an amount outside the above range may be employed.
  • the compounds of the present invention may be formulated into various suitable formulations depending upon the manner of administration, in accordance with conventional methods commonly employed for the preparation of pharmaceutical formulations.
  • tablets, capsules, granules or pills for oral administration may be prepared by using an excipient such as sugar, lactose, glucose, starch or mannitol; a binder such as sirups, gum arabic, gelatin, sorbitol, tragacant gum, methyl cellulose or polyvinylpyrrolidone; a disintegrant such as starch, carboxymethyl cellulose or its calcium salt, crystal cellulose powder or polyethylene glycol; a gloss agent such as talc, magnesium or calcium stearate or colloidal silica; or a lubricant such a sodium laurate or glycerol.
  • an excipient such as sugar, lactose, glucose, starch or mannitol
  • a binder such as sirups, gum arabic, gelatin, sorbitol, tragacant gum, methyl cellulose or polyvinylpyrrolidone
  • a disintegrant such as starch, carboxymethyl cellulose
  • the injections, solutions, emulsions, suspensions, sirups or aerosols may be prepared by using a solvent for the active ingredient such as water, ethyl alcohol, isopropyl alcohol, propylene glycol, 1,3-butylene glycol, or polyethylene glycol; a surfactant such as a sorbitol fatty acid ester, a polyoxyethylene sorbitol fatty acid ester, a polyoxyethylene fatty acid ester, a polyoxyethylene ether of hydrogenated caster oil or lecithin; a suspending agent such as a sodium salt of carboxymethyl, a cellulose derivative such as methyl cellulose, or a natural rubber such as tragacant gum or gum arabic; or a preservative such as a paraoxy benzoic acic ester, benzalkonium chloride or a salt of sorbic acid.
  • the suppositories may be prepared by using e.g. polyethylene glycol, lanolin or coco
  • SRS-A which is an important mediator for immediate allergy such as bronchoconstriction in bronchial asthma, has already been found to be leukotriene C 4 (hereinafter referred to as LTC 4 ), leukotriene D 4 (herein eferred to as LTD 4 ) or the like. Accordingly, antagonistic activities against SRS-A can be evaluated by any one of the following test methods:
  • the present inventors examined the antagonistic activities against SRS-A by using the test methods (1) to (3).
  • Antagonisms for LTC 4 and LTD4 were determined in isolated guinea-pig trachea prepared as spiral strip. Tracheal preparations were suspended under 1 g tension in 10 ml organ baths and they were incubated for 1 hr prior to use. Contractile responses to LTC 4 (2 x 10 -8 g/ml) and LTD 4 (2 x 10-a g/ml) were obtained after the maximal responses to histamine (10- 4 M).
  • Test compounds dissolved in 100% dimethyl sulfoxide were added to the organ baths (final concentration of 10 -5 g/ml or 10- 6 g/ml) 5 min prior to LTC 4 and LTD 4 addition, and then contractile responses to LTC 4 and LTD 4 were compared with those of control which was obtained from a paired trachea in the absence of test compounds.
  • LTC 4 - and LTD 4 -induced contractions were expressed as a percentage of the maximal response to histamine.
  • the antagonism was determined as follows:
  • Antagonism for LTD 4 was determined in isolated guinea-pig trachea prepared as spiral strip. Tracheal preparations were suspended under 1 g tension in 10 ml organ baths containing 5 pmol of indomethacin and they were incubated for 1 hr prior to use. Contractile responses to LTD 4 (2 x 10 -8 g/ml) were obtained after the maximal response to histamine (10 -4 M). Test compounds dissolved in 100% dimethyl sulfoxide were added to the organ baths (final concentration of 10 -6 g/ml) 30 min prior to LTD 4 addition, and then contractile responses to LRD 4 were compared with those of control which was obtained from a paired trachea in the absence of test compounds. LTD 4 -induced contractions were expressed as a percentage of the maximal response to histamine. The antagonism was determined as follows:
  • guinea-pig 350-450 g were passively sensitized with intravenous (i.v.) injection of 0.125 ml rabbit anti-EA (egg albumin) serum (Cappel laboratories) 1 day preceding the experiment.
  • Antigen-induced anaphylactic bronchoconstrictions were measured by modified method of Konzett and Rossler (Arch. Exp. Path. Pharmak., 195, 71, 1940).
  • Sensitized guinea-pigs were anaesthetized with intraperitoneal injection of urethane (1.5 g/kg). the right jugular vein was cannulated for the administration of all the agents and trachea was cannulated to record total pulmonary resistance.
  • Guinea-pigs were artificially ventilated by a small animal respirator (Shinano, Model SNB-480-7) set at a stroke volume of 5 ml and a rate of 50 breaths per min.
  • the change in pulmonary resistance was measured with a pressure transducer (Nihon Kohden, Model TP-602T) connected to a T-tube on the tracheal cannula.
  • the increase in air overflow volume was expressed as a percentage of the maximum bronchoconstriction obtained by clamping off the trachea.
  • Inhibition (%) (1.0 - maximum bronchoconstriction in test/% maximum bronchoconstriction in control) x 100. The maximum bronchoconstriction was obtained within 20 min after the EA challenge.
  • the number of test animals was 4 and the mean inhibition was compared with that of FPL-55712 (Fisons Limited) of the following formula:
  • the dose of EA was 10 mg/kg, and each compound was dissolved or suspended in 3% Tween 80.
  • the lethal ratio was determined in ddY strain male mice (4 weeks old) at 7 days after the oral administration of test compounds. The results are shown in Table 6.
  • the lethal ratio was determined in ddY strain male mice (4 weeks old) at 7 days after the intraperitoneal injection of test compounds. The results are shown in Table 7.
  • the compounds of the present invention produce prominent effects on the antagonism for SRS-A and its major constituents LTC 4 and LTD 4 in vitro and in vivo. Therefore, the compounds of the present invention are proved to be useful for prophylactic and therapeutic drugs in SRS-A-induced various allergic diseases, for example, bronchial asthma, allergic rhinitics and urticaria.
  • NMR nuclear magnetic resonance spectrum
  • MS mass spectrometry
  • Me means a methyl group
  • Et an ethyl group
  • Pr a propyl group
  • Ac a acetyl group
  • Bu a butyl group
  • Pen a pentyl group.
  • a mixture comprising 24.4 g of 2-ethylphenol, 40 g of carbon tetrachloride, 120 ml of a 50% sodium hydroxide aqueous solution and 1.0 g of copper powder was refluxed under stirring for 8 hours. After cooling, the brown reaction mixture was acidified with concentrated hydrochloric acid and extracted with ethyl acetate. The extract was treated with activated charcoal (5 g) and silica gel (30 g), and the filtrate was extracted with a saturated sodium hydrogen carbonate aqueous solution. The extract was acidifed by gradually adding an aqueous hydrochloric acid solution to the extract under cooling with ice, and then extracted with ethyl acetate.
  • the extract was washed sequentially with water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, the solvent was distilled off to obtain 12.38 g of 2-ethyl-4-carboxyphenol as a reddish purple solid substance.
  • 2-i-propyl-4-methoxycarbonylphenol, 2-ethoxycarbonylphenol and 2- sec-butyl-4-methoxycarbonylphenol were prepared from 2-i-propylphenol, 2-ethoxyphenol and 2-sec-butylphenol, respectively.
  • a mixture comprising 29.75 g of 4-cyanophenol, 33.27 g of allyl bromide, 41,46 g of potassium carbonate and 350 ml of acetone, was refluxed under stirring for 4 hours. Acetone was distilled, and water was added to the residue. The mixture was extracted with benzene. The benzene layer was washed sequentially with a 5% sodium hydroxide aqueous solution and water, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a pale yellow oily substance. The residual substance was crystallized from n-hexane-ethyl ether to obtain 38.16 g of 4-allyloxy benzonitrile as colorless crystals having a melting point of from 40.5 to 41°C.
  • the solvent of the filtrate was distilled off, and a pale yellow oil substance thereby obtained was crystallized from ethyl ether-n-hexane to obtain 24.90 g of the above identified compound as colorless crystals having a melting point of from 83 to 83.5°C.
  • 2-allyl-4-methoxyphenol oil substance
  • 2-allyl-4-methoxycarbonylphenol crystals, melting point: 85-88°C
  • 2-allyl-4-ethoxycarbonylphenol were prepared from 4-methoxyphenol, p-hydroxybenzoic acid methyl ester and p-hydroxybenzoic acid ethyl ester, respectively.
  • 2--n-propyl-4-methoxyphenol (oily substance), 2-n-propyl-4-methoxy- carbonylphenol (crystals) and 2-n-propyl-4-ethoxycarbonylphenol were prepared from 2-allyl-4-methoxyphenol, 2-allyl-4-methoxycarbonylphenol and 2-allyl-4-ethyoxycarbonylphenol prepared in Reference Example 1-(ii), respectively.
  • the alkali extract layer was washed twice with chloroform, and then acidified to a pH of about 2 by gradually adding concentrated hydrochloric acid. Then, the mixture was extracted with ethyl acetate. The extract was washed sequentially with water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a dark reddish purple oily substance.
  • This product was purified by silica gel column chromatography by using benzene-ethyl acetate (16:1, v/v) as the developer, whereby 6.90 g of the above identified compound was obtained as a pale red oil substance.
  • n-butyryl chloride 25.0 g was dropwise added to a mixture comprising 38.06 g of 4-bromophenol, 19.75 g of pyridine and 500 ml of benzene under stirring and cooling with ice. After the completion of the dropwise addition, the reaction mixture was stirred at room temperature for 1 hour. Water was added to the reaction mixture, and the benzene layer was separated. The benzene layer was washed sequentially with water, 2% dilute hydrochloric acid, water and a aqueous sodium hydrogen carbonate solution and dried over sodium sulfate. Then, the solvent was distilled off to obtain 53.5 g of 4-bromo-n-butyryl phenolate as a pale yellow oily substance.
  • a mixture comprising 31.12 g of the above phenol, 18.81 g of benzyl bromide, 18.24 g of potassium carbonate and 300 ml of acetone, was stirred at room temperature for 2 days. Acetone was distilled off, and water was added to the residue. The mixture was extracted with benzene. The benzene layer was washed with a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a pale yellow oily substance.
  • This substance was subjected to silica gel column chromatography by using benzene-n-hexane (1:9, v/v) as the developer, whereby 30.07 g of (2-n-butyl-4-bromophenyl) benzyl ether was obtained as a colorless oily substance.
  • the Grignard reagent thus prepared was dropwise added to a mixture comprising 50 g of pulverized solid of dry ice and 300 ml of dried tetrahydrofuran, under stirring. During the dropwise addition, 100 g of dry ice was further added. After the completion of the dropwise addition, the reaction mixture was stirred for further 2 hours.
  • a mixture comprising 2.86 g of the thiophenolate thus obtained, 30 ml of dried methanol and 3.0 ml of a 28% sodium methoxide methanol solution, was stirred at room temperature for 15 hours. Then, 1.5 ml of a 28% sodium methoxide methanol solution was added, and the mixture was stirred for further 5 hours.
  • the reaction mixture was acidified to a pH of about 2 by gradually adding concentrated hydrochloric acid thereto, and then the solvent was distilled off. Water was poured into the dark brown oily residue thus obtained, and the mixture was extracted with benzene. The benzene layer was washed sequentially with water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate.
  • the oily substance was purified by silica gel column chromatography by using benzene-n-hexane (2:1, v/v) as the developer, whereby 1.13 g of the above identified compound was obtained as a colorless oily substance.
  • Methyl 4-hydroxy-y-oxobenzene butanoate This compound was prepared in accordance with a method disclosed in Example 1 of Japanese Unexamined Patent Publication No. 139342/1984.
  • a mixture comprising 5.0 g of 4-chloro-5-hydroxy-2-t-butyl-3(2H)pyridazinone, 4.2 g of 1-bromo-3-chloropropane, 3.7 g of anhydrous potassium carbonate and 30 ml of dimethylformamide, was stirred at a temperature of from 70 to 80°C for 3 hours.
  • the reaction mixture was transferred to separating funnel, and 100 ml of water and 50 ml of benzene were added thereto. The mixture was shaken vigorously, and the benzene layer was washed with water and dried over anhydrous sodium sulfate.
  • 4-chloro-5-(2- chlorethyloxy)-2-i-propyl-3(2H)pyridazinone (crystals, melting point: 100 -103°C) was prepared from 4-chloro-5-hyroxy-2-i-propyl-3(2H)pyridazinone.
  • a mixture comprising 4.42 g of 4,5-dichloro-2-t-butyl-3(2H)pyridazinone, 4.50 g of 3-amino-1-propanol, 4.15 g of potassium carbonate, 25 ml of 1,4-dioxane and 80 ml of water, was refluxed under stirring for 18 hours.
  • 1,4-Dioxane was distilled off under reduced pressure, and the residue thereby obtained was extracted with ethyl acetate.
  • the extract was washed sequentially with dilute hydrochloric acid, water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a pale yellow viscous oily substance.
  • the oily substance was purified by silica gel column chromatraphy, whereby 3.54 g of the above identified compound was obtained from the chloroform-methanol (20: 1, v/v) eluate as a pale yellowish orange viscous oily substance.
  • 4-bromo-5-(3-hydroxyethylamino)-3(2H)pyridazinone (crystals, melting point: 121-123°C) was prepared from 4-dibromo-2-i-propyl-3(2H)-pyridazinone.
  • a mixture comprising 5.18 g of 4,5-dichloro-2-i-propyl-3(2H)pyridazinone, 7.97 g of 2,3-dihydroxypropylamine, 8 ml of 1,4-dioxane and 80 ml of water, was stirred at a temperature of from 75 to 80°C for 17 hours. Most 1,4-dioxanewas distilled off under reduced pressure, and the reaction mixture was acidified to a pH of about 2 by adding dilute hydrochloric acid, and sodium chloride was added to the saturation. Then, the mixture was extracted with tetrahydrofuran (200 ml x 2).
  • the extract was washed with a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a colorless solid substance.
  • the solid substance was crystallized from ethyl acetate-ethyl ether to obtain 5.30 g of the above identified compound as colorless crystals having a melting point of from 137 to 139°C.
  • a mixture comprising 14.0 g of 2-t-butyl-4-n-propyl-5-chloro-3(2H)pyridazinone, 44 g of hydroxypropylamine and 14.8 g of anhydrous potassium carbonate, was stirred at a temperature of from 145 to 155°C for 12.5 hours.
  • the reaction solution was returned to room temperature, and about 200 ml of cold water was added.
  • the mixture was stirred.
  • the precipitated white crystals were collected by filtration, and dried to obtain 12.1 g of the above identified compound having a melting point of from 167 to 169°C.
  • 3-(3-methoxyphenoxy)propylbromide [oily substance, boiling point: 102-105°C (1.0 mmHg)]
  • 3-(2-chloro-4-ethoxycarbonylphenoxy)propylbromide (oily substance) were prepared from 3-methoxyphenol and 2-chloro-4-ethoxycarbonylphenol respectively.
  • a mixture comprising 0.5 g of 4,5-dichloro-2-ethyl-3(2H)pyridazinone, 1.18 g of 4-methoxyphenylethylamine, 0.36 g of potassium carbonate, 18 ml of water and 6 ml of 1,4-dioxane, was refluxed under stirring for 8 hours. Then, 1,4-dioxane was distilled off under reduced pressure, and the residue thereby obtained was extracted with ethyl acetate. The extract was washed sequentially with dilute hydrochloric acid and water, and dried over sodium sulfate. Then, solvent was distilled off.
  • the residue was purified by silica gel column chromatography by using benzene-ethyl acetate (1:1, v/v) as the developer, whereby 400 mg of the above identified compound was obtained as colorless crystals having a melting point of from 135 to 135.5°C.
  • a mixture comprising 1.36 g of 3-(2-chloro-4-ethoxycarbonylphenoxy)propylbromide prepared from 2-chloro-4-ethoxycarbonylphenol and 1,3-dibromopropane in Reference Example 8, 0.74 g of 2-ethyl-4-chloro-5-hydroxy-3(2H) pyridazinone, 0.64 g of anhydrous potassium carbonate and 5 ml of N,N-dimethylformamide, was stirred at a temperature of from 70 to 80°C for about 4 hours. To the reaction mixture, 50 ml of water was added, and the mixture was vigorously stirred, and then transferred to a separating funnel. Then, the mixture was extracted with 50 ml of benzene, the extract was washed once with a 2% hydrochloric acid aqueous solution and once with water, and then dried over anhydrous magnesium sulfate.
  • the solvent was distilled off, and the crystals thereby obtained were recrystallized from hexane-ethyl acetate to obtain 1.14 g of the above identified compound as colorless crystals having a melting point of from 101 to 103°C.
  • a mixture comprising 1.0 g of 4-chloro-5-(3-chloropropyloxy)-2-t-butyl-3(2H)pyridazinone obtained in Reference Example 3, 0.7 g of 2,4-dihydroxy-3-n-propylacetophenone, 1.0 g of anhydrous potassium carbonate, 0.6 g of potassium iodide and 5 ml of dimethylformamide, was stirred at a temperature of from 70 to 80°C for 3 hours. To the reaction mixture, 20 ml of water and 20 ml of benzene were added, and the mixture was vigorously shaken. The benzene layer was washed with water and dried over anhydrous sodium sulfate.
  • the solvent was distilled off, and the pale yellow oily substance thereby obtained was extracted with benzene.
  • the extract was washed sequentially with dilute hydrochloric acid, water (twice) and a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, solvent was distilled off to obtain a pale yellow oily substance.
  • the oily substance was purified by silica gel column chromatography by using benzene-ethyl acetate (1:1, v/v) as the developer, to obtain 4.67 g of the above identified compound as a pale yellow viscous oily substance.
  • a mixture comprising 1.24 g of Compound No. 15 prepared in Example 4, 0.53 g of 2-n-propyl-4-cyanophenol, 150 mg of sodium iodide, 1.04 g of potassium carbonate and 30 ml of 2-butanone, was refluxed under stirring for 5 hours.
  • the solvent was distilled off, and water was added to the residue thereby obtained.
  • the mixture was extracted with chloroform.
  • the extract was washed sequentially with a 5% sodium hydroxide aqueous solution and a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a pale yellowish orange viscous oily substance.
  • the residual oily substance was crystallized from ethyl ether-benzenehexane to obtain 0.83 g of the above identified compound as colorless crystals having a melting point of from 96 to 97°C.
  • a mixture comprising 483 g of Compound No. 1 prepared in Example 5, 390 mg of sodium azide, 385 mg of ammonium chloride an 5 ml of dimethylformamide, was stirred at 120°C for 5 hours.
  • the solvent was distilled off, and dilute hydrochloric acid was added to the residue thereby obtained.
  • the mixture was extracted with ethyl acetate.
  • the extract was washed sequentially with water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate.
  • the solvent was distilled off to obtain a pale yellow viscous oily substance.
  • the oily substance was subjected to silica gel column chromatography, and the colorless solid substance obtained by eluting with chloroform-methanol (20:1, v/v) was crystallized from methanol-ethyl ether to obtain 263 mg ofthe above identified compound as colorless crystals having a melting point of from 189 to 190°C.
  • a mixture comprising 2.015 g of Compound No. 1 prepared in Example 5, 7.5 ml of sulfuric acid and 30 ml of methanol, was refluxed under stirring for 9.5 hours. Methanol was distilled off, and sodium hydrogen carbonate and water were gradually added to the pale brown residue thereby obtained, under cooling with ice, for neutralization. Then, the mixture was extracted with ethyl acetate. The extract was washed sequentially with water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate. The solvent was distilled off to obtain a pale yellow oily substance.
  • a mixture comprising 456 mg of Compound No 4 prepared in Example 7, 207 mg of potassium carbonate, 0.5 ml of ethyl iodide and 5 ml of N,N-dimethylformamide, was stirred at 60°C for 2 hours.
  • the solvent was distilled off, and water was added to the pale brown oily substance thereby obtained.
  • the mixture was extracted with ethyl acetate.
  • the extract was washed with water, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a pale yellow oily substance.
  • the oily substance was subjected to silica gel column chromatography, and 480 mg of the above identified compound was obtained as a pale yellow semi-solid substance from the eluate with chloroform-methanol (30:1, v/v).
  • a mixture comprising 370 mg of Compound No. 6 prepared in Example 8, 10 ml of methanol and 1.0 ml of a 2N sodium hydroxide aqueous solution, was refluxed for 1.5 hours. Then, 0.5 ml of a 2N sodium hydroxide aqueous solution was further added thereto, and the refluxing was continued for 30 minutes. After cooling, the reaction mixture was acidified to a pH of about 7.0 by adding dilute hydrochloric acid thereto, and then the solvent was distilled off. Dilute hydrochloric acid was poured into the residue thereby obtained, and the mixture was extracted with ethyl acetate.
  • the extract was washed with water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a pale yellow solid substance. The solid substance was recrystallized twice from methanol- ether to obtain 160 mg of the above identified compuond as colorless crystals having a melting point of from 164 to 165°C.
  • a mixture comprising 130 mg of Compound No. 41 i.e. 4-chloro-5-[3-(2-n-propyl-4-carboxyphenoxy)propylamino]-2-i-propyl-3(2H)pyridazinone, 62 mg of N,N'-carbonyldiimidazole and 20 ml of N,N-dimethylformamide, was stirred at room temperature for 1 hour, and then ammonia gas was bubbled into the mixture for 10 minutes under cooling with ice. The system was closed and left to stand at room temperature for 2 hours. Then, the solvent was distilled off under reduced pressure.
  • a mixture comprising 2.0 g of 4-chloro-5-(2-oxiranylmethoxy)-2-i-propyl-3(2H)pyridazinone prepared in Reference Example 5, 1.5 g of 2-n-propyl-4-cyanophenol, 1.35 g of potassium carbonate and 80 ml of diethyl ketone, was refluxed under stirring for 8 hours. Then, diethyl ketone was distilled off under reduced pressure, and the residue thereby obtained was extracted with ethyl acetate. The extract was washed with water and dried over sodium sulfate. Then, the solvent was distilled off.
  • the residue was purified by silica gel column chromatography by using benzene-ethyl acetate (1:1, v/v) as the developer.
  • the colorless crystals thereby obtained was recrystallized from ethyl ether to obtain 1.3 g of the above identified compound as colorless crystals having a melting point of from 118.5 to 121°C.
  • the extract was washed sequentially with water, a saturated sodium hydrogen carbonate aqueous solution and a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a colorless oily substance.
  • the oily substance was purified by silica gel column chromatography and 2.45 g of the above identified compound was obtained as a colorless viscous oily substance from the eluate with chloroform-methanol (25:1 v/v).
  • a mixture comprising 1.62 g of Compound No. 142 i.e. the tosyloxy product prepared in Example 12, 690 mg of 2-n-propyl-4-cyanothiophenol prepared in Reference Example 1-(vii), 585 mg of sodium iodide, 1.35 g of potassium carbonate and 40 ml of diethyl ketone, was refluxed under stirring for 18 hours.
  • the solvent was distilled off, and water was added to the residue thereby obtained.
  • the mixture was extracted with chloroform.
  • the extract was washed sequentially with a 5% sodium hydroxide aqueous solution, water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate.
  • the solvent was distilled off to obtain a pale yellow oily substance.
  • the oily substance was crystallized from a mixture of ethyl acetate-ethyl ether-benzene to obtain 1.12 g of the above identified compound as colorless crystals having a melting point of from
  • the extract was washed sequentially with water and a saturated sodium chloride aqueous solution, and dried over sodium sulfate. Then, solvent was distilled off to obtain 365 mg of the above identified compound as a pale yellowish orange viscous oily substance.
  • 0.036 g of sodium hydride (55% mineral oil suspension) was added to a mixture comprising 300 mg of 4-chloro-5-[3-(2-n-propyl-4-cyanophenoxy)-2-hydroxypropoxy]-2-i-propyl-3(2H)pyridazinone (Compound No. 171) prepared in Example 11, 0.13 g of methyl iodide and 15 ml of tetrahydrofuran, under cooling with ice, and the mixture was stirred at room temperature for 2 hours. Then, 0.13 g of methyl iodide and 0.036 g of sodium hydride were further added thereto, and the mixture was stirred for 2 hours.
  • a mixture comprising 0.82 g of 4-chloro-5-(3-(2-n-propyl-4-ethoxycarbonylphenoxy)propylamino]-2-i-propyl-3(2H)pyridazinone (Compound No. 64), 50 ml of ethanol, 1.5 ml of triethylamine and 150 mg of 5% palladium-carbon was subjected to hydrogenation under stirring at a temperature of from 40 to 50°C for 3 hours. The reaction mixture was filtered, and the filtrate was concentrated. The crude crystals thereby obtained were recrystallized from ethyl ether to obtain 0.58 g of the above identified compound as colorless crystals having a melting point of from 111 to 116°C.
  • a mixture comprising 1.34 g of 4-chloro-5-[3-(2-ethyl-4-formylphenoxy)propylamino]-2-ethyl-3(2H) pyridazinone (Compound No. 92), 0.73 g of malonic acid, one drop of piperidine and 12 ml of pyridine, were heated under stirring at 100°C for 3 hours. After cooling, the reaction solution was acidified with hydrochloric acid, and extracted with ethyl acetate. The extract was washed twice with water, and dried over sodium sulfate.
  • a mixture comprising 168 mg of 4-chloro-5-[3-(2-n-butyl-4-carboxyphenoxy)propylamino]-2-i-propyl-3(2H) pyridazinone (Compound No. 112), 119 mg of thionyl chloride and 10 ml of dried tetrahydrofuran, was refluxed under stirring for 1 hour.
  • the reaction mixture was subjected to distillation under reduced pressure.
  • 20 ml of dried benzene was added.
  • the mixture was again subjected to distillation under reduced pressure to remove excess thionyl chloride by azeotropic distillation.
  • the residual oily substance thereby obtained was dissolved in 10 ml of dried tetrahydrofuran, and ammonia gas was introduced thereinto for 5 minutes under cooling with ice. Then, the reaction solution was further stirred for 15 minutes. The reaction mixture was subjected to distillation under reduced pressure, and water was poured into the residue thereby obtained. The mixture was extracted with chloroform. The extract was washed sequentially with a 5% sodium hydroxide aqueous solution and a saturated sodium chloride aqueous solution, and dried over sodium sulfate.
  • a mixture comprising 316 mg of 4-bromo-5-[3-(2-n-butyl-4-carbamoylphenoxy)propylamino]-2-ethyl-3(2H)pyridazinone (Compound No. 180), 174 mg of p-toluenesulfonyl chloride, 110 mg of pyridine and 5 ml of N,N-dimethylformamide, was stirred at 95°C for 1.5 hours. The reaction mixture was subjected to distillation under reduced pressure. Water was poured into the residual oily substance, and the mixture was extracted with ethyl acetate.
  • the extract was washed sequentially with 5% dilute hydrochloric acid, water and a saturated sodium hydrogen carbonate aqueous solution, and dried over sodium sulfate. Then, the solvent was distilled off to obtain a pale yellow oily substance.
  • the oily substance was crystallized from ethyl ether to obtain 248 mg of the above identified compound as colorless crystals having a melting point of from 107.5 to 108.5°C
  • Ice pieces were gradually added to the mixture to decompose excess aluminum chloride, and the mixture was extracted with chloroform. The extract was washed with water and dried over sodium sulfate. Then, the solvent was distilled off, and the residue thereby obtained, was crystallized from ethyl ether-n-hexane to obtain 0.26 g of the above identified compound as colorless crystals having a melting point of from 112 to 112.5°C.
  • the compounds prepared in accordance with the above Examples are shown in Table 8.
  • the process number indicated in the second column from the right hand side is the process number used for the preparation.
  • the Example No. in the right hand side end column is the Example No. in accordance with which the particular compound was prepared.
  • the above components were mixed in a usual manner, and formulated into sugar-coated tablets each containing 50 mg of an active ingredient.
  • the above components were mixed in a usual manner, and filled into a gelatin capsule to obtain capsules each containing 50 mg of an active ingredient.
  • composition (A) was mixed.
  • the solution mixture thereby obtained was charged in a container equipped with a valve, and the propellant (B) was injected from a valve nozzle to a gauge pressure of from about 2.46 to 2.81 kg/cm 2 to obtain an aerosol suspension.

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EP86102467A 1985-02-27 1986-02-26 3(2h)pyridazinone, process for its preparation and anti-allergic agent containing it Expired - Lifetime EP0193853B1 (en)

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CN100513392C (zh) * 2003-02-07 2009-07-15 默克尔有限责任公司 杂芳基取代的丙酮衍生物作为磷脂酶a2的抑制剂

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DE4009761A1 (de) * 1989-07-28 1991-01-31 Bayer Ag 2h-pyridazinon-derivate
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ES2033581B1 (es) * 1991-07-30 1993-12-16 Uriach & Cia Sa J Procedimiento para la obtencion de nuevas tetralonas.
HU214320B (hu) * 1991-12-20 1998-03-02 EGIS Gyógyszergyár Rt. Eljárás új 3(2H)-piridazinon-származékok és ezeket tartalmazó gyógyszerkészítmények előállítására
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CN100513392C (zh) * 2003-02-07 2009-07-15 默克尔有限责任公司 杂芳基取代的丙酮衍生物作为磷脂酶a2的抑制剂

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EP0193853A3 (en) 1987-07-22
ATE56441T1 (de) 1990-09-15
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US4783462A (en) 1988-11-08
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